Average income of A for 15 days is Rs.,70. average for first five days is Rs., 60 and that for last

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The average income of $A$ for $15$ days is $Rs.\,70.$ The average for first five days is $Rs.\, 60$ and that for the last nine days is $Rs.\,80.$ A's income for the sixth day is (in $Rs.\,$ )

A

$80$

B

$60$

C

$40$

D

$30$

Solution

Income for $6^{th}$ day in rupees $=15 \times 70-5 \times 60-9 \times 80=30$

Standard 13

Quantitative Aptitude

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